Aquarium Lighting

Selecting the right light depends on several factors including your tank’s dimensions, the coral species you keep, and your long-term goals. Deeper tanks may require higher output lights to ensure adequate PAR at the bottom, especially for SPS corals. Some lights have a narrower spread ideal for nano tanks, while others are designed for even coverage in larger systems. Look for fixtures that allow spectrum customization, as different corals respond to specific wavelengths for optimal photosynthesis and coloration. If you’re unsure, our team can recommend a model based on your system’s size and livestock.

Corals primarily utilize blue and violet light in the 400–500nm range for photosynthesis through their symbiotic zooxanthellae. Most reef lights emphasize this spectrum, often referred to as "reef spectrum" or "actinic lighting." However, adding balanced white light and trace wavelengths like UV can help enhance visual color and support coral fluorescence. Spectrum control allows reefers to fine-tune coloration over time and can also reduce nuisance algae by avoiding excess red or warm white light.

Most reef tanks do well with a photoperiod of 8–12 hours of full-intensity lighting, with an additional ramp-up and ramp-down period to simulate sunrise and sunset. This gradual shift helps reduce light shock and supports a more natural environment for corals and fish. Many modern LED systems allow precise control over timing and intensity through apps or controllers. Be consistent with your schedule—corals thrive with stability, and even minor shifts can affect their growth or behavior.

PAR (Photosynthetically Active Radiation) measures the total amount of usable light within the 400–700nm range that reaches your coral. Spectrum refers to the specific wavelengths within that range. Both matter: PAR ensures your corals are receiving enough energy, while spectrum determines how effectively they can use that energy. Too much PAR in the wrong spectrum can lead to bleaching, while too little can stunt growth. Measuring PAR with a meter at coral level helps determine whether lighting is truly sufficient.

Yes, many modern aquarium lights are designed to be modular or customizable without replacing the entire fixture. While lens swaps are rare in most consumer models, accessories like diffusers can help soften the light spread and reduce shadowing, making it easier to achieve uniform coverage across your reef. Many systems also support add-on controllers or app integrations that give you advanced spectrum control, scheduling, and automation options. If you're looking to expand coverage, adding additional light units or adjusting mounting height can often do the trick. Just remember to acclimate your corals gradually when making changes, especially if PAR levels increase significantly.